Commentary and articles about relevant issues, authored by a former editor of Roads and Bridges magazine.

Information about these highways which have been set aside as most important in the 1998 bill "Transportation Equity Act for the 21st Century (TEA-21)".

Gallery of shields along roads with more than one route number.

Covers Kentucky, Ohio Tennessee, Virginia, and West Virginia and surrounding areas. Photography, historical information, and forum.

Travelogue and old postcard scans. Page linked is Louisiana but there are also pages on Texas, Mississippi, Alabama, and Florida.

Information and some history.

Covers the respective region of the country. Includes historic maps, planning documents and reports, and photos.

Unofficial site which explains these potential thoroughfares.

List of Average Daily Traffic (ADT) tallies for major metropolitan areas.

Weblog of a 2006 trip documenting U.S. 6 in comments and photographs.